This script will convert a 32-bit number into an IP address. This script is usually used by other TCP/IP scripts, not necessarily directly. This script also requires New-CmnLogEntry
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Function ConvertTo-CmnCidr { <# .SYNOPSIS Converts IP address and subnet mask to a CIDR address .DESCRIPTION Converts IP address and subnet mask in put to a CIDR address. This function als requires New-CmnLogEntry .PARAMETER ipAddress IP Address in dotted decimal notation .PARAMETER subnetMask Subnet mask in dotted decimal notation .PARAMETER logFile File for writing logs to (default is C:\Windows\Temp\Error.log). .PARAMETER logEntries Set to $true to write to the log file. Otherwise, it will just be New-CMNLogEntry -Entry (default is $false). .PARAMETER maxLogSize Max size for the log (default is 5MB). .PARAMETER maxLogHistory Specifies the number of history log files to keep (default is 5). .EXAMPLE ConvertTo-CmnCidr -ipAddress 192.168.0.1 -subnetMask 255.255.240.0 will return 192.168.0.1/20 .LINK http://configman-notes.com .NOTES Author: Jim Parris Email: Jim@ConfigMan-Notes PSVer: 2.0/3.0 Version: 1.0.0 Date: 2018-12-26 Updated: 2020-07-10 Cleanup/comment #> [CmdletBinding(ConfirmImpact = 'Low')] Param( [Parameter(Mandatory = $true, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true, HelpMessage = 'IP Address in dotted decimal notation')] [ValidatePattern('^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$')] [string]$ipAddress, [Parameter(Mandatory = $true, HelpMessage = 'Subnet mask in dotted decimal notation')] [ValidatePattern('^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$')] [String]$subnetMask, [Parameter(Mandatory = $false, HelpMessage = 'File for writing logs to (default is C:\Windows\Temp\Error.log).')] [String]$logFile = 'C:\Windows\Temp\Error.log', [Parameter(Mandatory = $false, HelpMessage = 'Set to $true to write to the log file. Otherwise, it will just be write-verbose (default is $false).')] [Boolean]$logEntries = $false, [Parameter(Mandatory = $false, HelpMessage = 'Max size for the log (default is 5MB).')] [Int]$maxLogSize = 5242880, [Parameter(Mandatory = $false, HelpMessage = 'Specifies the number of history log files to keep (default is 5).')] [Int]$maxLogHistory = 5 ) begin { #Build splat for log entries $NewLogEntry = @{ logFile = $logFile; component = 'ConvertTo-CmnCidr'; logEntries = $logEntries; maxLogSize = $MaxLogSize; maxLogHistory = $maxLogHistory; } # Log variables New-CMNLogEntry -entry 'Starting Function' -type 1 @NewLogEntry New-CMNLogEntry -entry "ipAddress = $ipAddress" -type 1 @NewLogEntry New-CMNLogEntry -entry "subnetMask = $subnetMask" -type 1 @NewLogEntry New-CMNLogEntry -entry "logFile = $logFile" -type 1 @NewLogEntry New-CMNLogEntry -entry "logEntries = $logEntries" -type 1 @NewLogEntry New-CMNLogEntry -entry "maxLogSize = $maxLogSize" -type 1 @NewLogEntry New-CMNLogEntry -entry "maxLogHistory = $maxLogHistory" -type 1 @NewLogEntry } process { New-CMNLogEntry -entry 'Beginning process loop' -type 1 @NewLogEntry # Get each octet seperate $octets = $subnetMask -split "\." $subnetInBinary = @() # Let's convert the octets to binary foreach ($octet in $octets) { # Convert to binary $octetInBinary = [convert]::ToString($octet, 2) # Get length of binary string add leading zeros to make octet $octetInBinary = ("0" * (8 - ($octetInBinary).Length) + $octetInBinary) # Add to variable $subnetInBinary = $subnetInBinary + $octetInBinary } $subnetInBinary = $subnetInBinary -join "" New-CMNLogEntry -Entry "Subnet = $subnetInBinary" -type 1 @NewLogEntry # Now, let's make sure it's a valid subnet mask $x = 0 while ($subnetInBinary.Substring($x, 1) -eq '1') { $x++ } $networkBits = $x # OK, now we've got all the 1's, let's make sure the rest are 0's! do { if ($subnetInBinary.Substring($x, 1) -ne '0') { # No good, time to alert! $errorMessage = "The mask $subnetMask is invalid" New-CMNLogEntry -entry $errorMessage -type 3 @NewLogEntry throw $errorMessage } $x++ } while ($x -lt 32) } End { # Done! Log and send back the results $results = "$ipAddress/$networkBits" New-CMNLogEntry -entry "Returning $results" -type 1 @NewLogEntry New-CMNLogEntry -entry 'Completing Function' -type 1 @NewLogEntry Return $results } } #End ConvertTo-CmnCidr |